24 pc-e extreme edges when shifted.

If you have a 24 PC-E can you comment on the extreme edges when shifting your lens ? I'm noticing on some images that it seems to be pretty bad, and I'm not sure if it's a new development like something has happened to the lens to de-center the focus or if it's just the way it is and some how I've missed it by always having 'sky' in that particular corner.

I guess what I'm wondering is what's the potential for corner sharpness in this lens ? If you guys/girls say your copy is great I may consider sending mine back to Nikon for an adjustment.. has anyone sent in a 24 pc-e for adjustment ? Were you happy with the outcome ?

I'm in Canada, wondering if there is a 'preferred' Canadian location for shipping it to.. looks like BC, Ontario or Quebec are my choices..

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